The word "underclothes" is correct and usable in written English.
You can use it to refer to clothing worn next to the skin, under other clothing. For example, "I need to buy some new underclothes before I go to the beach."
Dress code is informal: street clothes, swimwear, underclothes, collar and tie, religious robes... Girls squat down to urinate wherever there is a dip in the sand – there are no toilet facilities.
A third of women and a fifth of men buy their underclothes at M&S.
Transmission can be prevented by wearing clean underclothes and by frequently changing one's clothes and washing conditions not always possible in time of war or mass migration.
The female lays her eggs, which hatch in about a week, in underclothes.
There are numerous clothes racks bearing dresses and gaucho costumes, there are men in underclothes, and women demurely manoeuvring bras off or on.
Cairo's Egyptian Museum is largely empty and one can look at the gold sarcophagus of Tutankhamun, or his chariots, walking sticks, gloves, socks and underclothes, without anybody else getting in the way.
He had stripped to his underclothes, and she saw that his body, like her own, was no longer in its prime but was strong yet, young enough still.
She settled her underclothes where he had disturbed them.
It could probably not be made today, since what Malle offers as a tender rite of passage — the final shot rings with untraumatized laughter — would now be construed as child abuse, and the scene where Laurent lays out his mother's underclothes to the sound of jazz (the whole film is an homage to Parker, Bechet, and Gillespie) may be the coolest Oedipal riff ever devised.
This monumental biography shows us the daughter of a prominent Victorian industrialist who excavated ruins, became a distinguished translator of Persian poetry, and scaled the Alps in her underclothes.
How else to explain her presence in my bed, her provocative underclothes, her frequent headaches, her prolonged sighs?
